This site will be taken down March 31st, 2026.

This was not an easy decision to make. For the last couple years, I have been struggling to find motivation for this site and to keep up with basic maintenance and security updates. With the rise of AI and more sophisticated tools, the usefulness of sites like this is questionable and traffic has nose-dived. I just don't have it in me to keep doing this. Thank you all for 10 years of support!

Zach

Word

うるう
embolism; intercalation
Word

閏年

うるう年
うるうどし、じゅんねん
leap year
Word

閏月

うるう月
うるうづき、じゅんげつ
intercalary month
Word

閏日

うるう日
うるうび
leap day
Word

閏秒

うるう秒
うるうびょう
leap second
Word

正閏

せいじゅん
normal and leap (years); legitimate and illegitimate dynasties